Lock attachment for snap-switches.



G. D. PLATT.

Loox ATTACHMENT PoRVsNAP SWITCHES.

AIPLGATION FILED TBB. 12, 1913.

1,076,907", Patented 901;. 28, 1913.

j ff

of this character, by lwhich the vswitch tney @provided wit-h1 operating ineens constrllcteel in accordzlnce"With the inventiongFig. 21sthe' slmnk le beneath the guard meniber 18 To@whenmag/femm;-

`onminirc 12. n eximir; en nnineneonn.

Connecticut; have inventedn Improvement l 'z in Lock'Attaehments for Snap-Switches, et

vvwhich the following-isfiv specification."

This 'invention relates yto electricjsnnp' Switches ha'fs 'for one `object toy provideI hey-actuated.; means -for operating switches' be easily operntedb'y-an authorized person toV open or' cltse the circutybut which Willbe extremelydiicult oil operation by unautl'1ori-zed'"pers0ns who 'mcy be inclined to Anotherobject 'of the-.invention is `to proride an operating device forswitches pron lock switch.

vided with means for engagement by a key,` which may be. readily substituted for the usual 'or regular tnr'nfbutton' or handle b which said switches aren'snally operate thereby converting an ordinary switch into Ajfurther object-ofthe inventiom'is to provide .mensiwhich willtend to injure the lingers of ,an unauthorized person who v may persistin atfernptingimproperly to opcrate the switch', thereby discouraging' such attempts. This feature of the invention is in connectionl with switches located at points Where tlieynrej likely'to be meddled Witlifby children.;

lVith these' and other objects in yvietri' have `devised the novel switchopernting means which I Awill new describe, .reference being hndto the accompanying V drawing-.

forming. e part of ,this speciioetion-in which- Figure l is n side'elevation of a switch a'fverticiil ysection thereofif'ig.' '3 is o plan `4View and Fig. e an elevaticnjpartly. 1n sec-1A tion Vofthe operating means detached; Fig.

j -5 is a plan View off' a -modifiedforrno theV guard member; Fig. 6 is'nplnn Viewof `a further modified guard 4nnenibcr end; o f

. slightly. modified '.jformV .of `ope-rating mem- 5 0 g'uardv member shown in Fig. Billig. 8 is n detail 'view'dfof the key'employed -for'sct'uatber; Fig. -7 is a detsil-sectionelaview of the Vfor engagement. by the prongs on n leuch tonexample. as that shown in Fig. 8.

ii'ispindle '1B 'to mzike andv break the`c11cintthrough contacts 1l; IThe speciicfom of .the switch mechanism formsjno pattf'ofjhepresent invention and will not -befdescribed in detail, but. may be of n'nynsunl or'well'fknown formoperated bye'spindlesiinilur to the spindle 13 shown.

in Fi 02.1 Said sindl'e 13 is providedn'ith --end'to which the reguler'mnnullv operated turnbutton is neu elly attachedy 15 denotes 'the keyectnatedswitch opereting member forming a part ofv the" pres- 'ent lnvention and which isy nrlsiptedf for ,attachment to the. switch spindle 13 in substit'ution 'for the usual turn-button. To this end said operating member comprises a body portion, provided with an internally' thrended sliank'l adapted to be screwed into "place on the end of the switch spindle. 13. The operating'4 member 15 is preferably round in outline. s formed with a smooth surface so es lobe with diiiiculty turned by vided with a pair of circular openings 17.

key,

.ldenotcs a'gunrd member (in-disk loosely mountedv on `the shank 16 and proi'ided with v:in .edge portionsurronndin'g 'the edge of said operating member. As shown 1n Figs.

l to 4, the edge portion of the guard member is formedns a series of ontwnrdly inclined points or angular p1'o1ect1ons 19. As

will loe-seen. anynttempt to grasp and turn the operating'member manually will bring the fingers into engagementwitb the peines 19, which' Will be pressed into and 'priclt' the tin' ere if any considerable pres sure' uponv t e operating member `is nttempted.'

-20 denotes a springr washer mounted -on s116121 ai. ber-'washer interposed between ber 18 in lose engagement with the operating member 115- and of holding the switch coverlijn close engagement with the buse 10. The'purpose' of the ber washer 2l is to prevent undue friction between thespring Washer-end this s'witcb cover. 22" denotes a preferably conical enlargement or bend 'formeclon the end of .the shank 16, ssi-id.

the fingers, nd, as. shown in Fig. '3. is prof over 'said head it will be retained in place on the shank 16 and serve also to retain the spring washer 20 and guardI member 18 in assembled position. v

In Fig. 5 is sho-wn a modied form of guard member 180 having a series of blunt projections 190 which, While performing substantially the same function as the points 19 on the guard member 18, will not tend to injure-the ngers of a person attempting to operate the switch manually.

In Figs. (i and 7 is shown still another form of guard member provided with a eontinuous, outwardly inclined iange 191 which, While not tending to injure the fingers of the operator, entirely surrounds the edge of the operating member`15'1 and pre 'vents the latter from being graeped and turned manually.

As shown in `Fig. 6, the operating member 151 is provided with a pair of angular slots 'corresponding to and serving the Same function as a circular opening 17 in the operating member 15.

' Having thusdescribed my invention I damn- 1. 'In a snap switch, the combination with .i va switch spindle, of an operating member engagement by a key, a guard member loosely mounted adjacent said operating member and having a series of points projecting beyond the edge of said operating member, and means for holding said guard member in close engagement with said operating member.

In testimony whereof I aiiix my signature in preseneeotl two Witnesses.

CLARENCE D. PLATT.

W'itnesses EDLA M. CULVER, S. W. A'rHnRroN. 

